[vsnet-outburst 3108] DM Dra - analysis of the 2001, Nov 14/15 observations - superhump period

[tonny.vanmunster@wanadoo.be]

<A message similar to the one below was bounced by my 
mail provider two nights ago. I\'m resending it.> 

Dear colleagues,

A quick update on my earlier message regarding the 
announcement of the SU UMa type nature of DM Dra.

On 2001, Nov 14/15, I accumulated 4.1 hours of CCD 
observations (269 datapoints), clearly revealing the 
presence of genuine, single-peaked superhumps with an 
amplitude of 0.36 mag, and a period of 0.0734 +/- 
0.0030 d (PDM technique). This value substantially 
differs from the one obtained by Howell et al. during 
quiescence (i.e. 125 min). 

The above observations firmly establish DM Dra as a new 
SU UMa type dwarf nova. Full information is available 
at http://vsnet.lunarpages.com/cbabelgium

To further refine the superhump period (longer 
baseline) and to study the evolution of the outburst 
development, I would recommend this object to receive 
sufficient attention from other observers worldwide

Thanks to Timo Kinnunen for his prompt notification of 
the outburst.

Kind regards,

Tonny Vanmunster
From CBA Braeside Observatory at Flagstaff, Arizona


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